alan@wopr:~$ sudo mir_demo_server
[sudo] password for alan: 
[1433265563.997771] mirplatform: Found graphics driver: mesa
[1433265563.998288] Server: Starting
[1433265563.998465] Loader: Loading modules from: /usr/lib/x86_64-linux-gnu/mir/server-platform
[1433265563.998519] Loader: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa.so.2
[1433265563.999028] mirplatform: Found graphics driver: mesa
ERROR: /build/buildd/mir-0.13.1+15.10.20150520/src/platform/graphics/platform_probe.cpp(59): Throw in function std::shared_ptr<mir::SharedLibrary> mir::graphics::module_for_device(const std::vector<std::shared_ptr<mir::SharedLibrary> >&)
Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: Failed to find platform for current system